MAG SIG P365 X-MACRO 21RD COY

The Sig Sauer 21-round magazine for the P365-XMACRO is a factory-spec 9mm double-stack magazine built to maximize capacity in Sig's most compact full-size platform. Whether you're running the P365-XMACRO, P365-FUSE, or P365-AXG LEGION, this steel magazine ships as standard with the FUSE model and pairs seamlessly with all 9mm P365 variants—from the P365 Standard through the XL. The coyote tan polymer baseplate matches the gun's finish and seats flush on XMACRO-sized grip modules; note that it will sit proud of Standard, X, and XL frames.

Built from steel with a black oxide finish, this magazine is engineered for reliable feeding and long service life. The orange follower makes it immediately obvious when the mag is empty—no second-guessing at the range or in the field. Rear witness holes let you confirm your round count at a glance without removing the magazine from your gun.

If you run a full-size P365-XMACRO or are looking to maximize ammo capacity in a compact 9mm duty or carry gun, a second or backup 21-round magazine adds practical flexibility. The magazine works across the entire P365 lineup, so it's a smart investment whether you're splitting range time between models or planning for rotation and maintenance.

Key Features

• 21-round capacity—maximum for P365-XMACRO platforms
• Steel construction with black oxide finish for durability
• Orange follower for clear empty-chamber indication
• Rear witness holes to verify loaded round count
• Coyote tan polymer baseplate matches modern tactical finishes
• Compatible with all 9mm P365 models

Specifications

Frequently Asked Questions

Will this 21-round P365-XMACRO magazine work in my P365 Standard or XL?

Yes, the 21-round magazine is compatible with all 9mm P365 models, including the Standard, X, XL, and XMACRO. However, the coyote tan baseplate is designed to seat flush on XMACRO-sized grip modules; on Standard, X, and XL frames, there will be a visible gap between the baseplate and the frame. Function and reliability are unaffected.

What comes with this magazine?

This is the magazine only. It ships with the orange follower and rear witness holes already installed. No additional components are included.

Is this magazine compatible with the P365-FUSE?

Yes. The 21-round magazine ships as standard equipment with the P365-FUSE model and is fully compatible with it and all other 9mm P365 variants.

How do I know when the magazine is empty?

The magazine features an orange-colored follower that rises to the top of the magazine tube when unloaded, making it easy to see at a glance. Rear witness holes also allow you to confirm the round count without removing the magazine from your gun.